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qUESTIONS

If an ammeter is connected in parallel to a circuit, it is likely to be damaged due to excess

The current flowing in a coil of resistance 90 Ω is to be reduced by 90%. What value of resistance should be connected in parallel with it

In the circuit shown, the galvanometer G of resistance 602 is shunted by a resistance r = 0.022. The current through R is nearly 1 A. The value of resistance R is (in ohms) is nearly

A galvanometer, having a resistance of 50 Ω gives a full scale deflection for a current of 0.05 A. The length in meter of a resistance wire of area of cross-section 2.97× 10^-2 cm² that can be used to convert the galvanometer into an ammeter which can read a maximum of 5 A current is (Specific resistance of the wire =5*10^-7Ωm)

The resistance of a wire is 20 ohm. It is so stretched that the length becomes three times, then the new resistance of the wire will be [2013]

A wire of a certain material is stretched slowly by ten percent. Its new resistance and specific resistance become respectively [2008]

A wire of resistance R is elongated n-fold to make a new uniform wire. The resistance of new wire [2017]

When a piece of aluminium wire of finite length is drawn through a series of dies to reduce its diameter to half its original value, its resistance will become [2002]

When a wire of uniform cross-section a, length I and resistance R is bent into a complete circle, resistance between any two of diametrically opposite points will be [2005]

Two bulbs X and Y having same voltage rating and of power 40 watt and 60 watt respectively are connected in series across a potential difference of 300 volt, then

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